Continuing  the preceding  paper  [5],  this one  illustrates  Cybernetic Modelling ,  applying it to  biologic stability.  A Lotka Volterra model  for preda tor prey spe cies  is employed  to  (discrete time)  modelling  homeostasis with hysteretic  delay ,  simulating (macrochronic) stability of simple cybernetic  (Barkhausen loop)  systems .  NL capability is  achieved replacing differential equations  by  iterative loops  (with polysemantic time  granularity)  and  employing  ( some )  non numeric mathematics .  The modelling subspecies is evaluated from  both transdisciplinary bridge  legs :  software engineering  (undemanding yet flexible  post industrial  apparatus )  and  biology/ecology  (versatile (field or laboratory) research  tool , with user friend ly interface, allowing to  write  “What if”  scenarios for handling  (over)simplified  ecologic  (sub) systems in  their  real world habitats ) .